Fast Fourier Transform IR Characterization of Epoxy GY Systems Crosslinked with Aliphatic and Cycloaliphatic EH Polyamine Adducts

Abstract

The use of fast FT-IR spectroscopy as a sensitive method to estimate a change of the crosslinking kinetics of epoxy resin with polyamine adducts is described in this study. A new epoxy formulation based on the use of polyamine adducts as the hardeners was analyzed. Crosslinking reactions of the different stoichiometric mixtures of the unmodified GY250 epoxy resin with the aliphatic EH606 and the cycloaliphatic EH637 polyamine adducts were studied using mid FT-IR spectroscopic techniques. As the crosslinking proceeded, the primary amine groups in polyamine adduct are converted to secondary and the tertiary amines. The decrease in the IR band intensity of epoxy groups at about 915 cm−1, as well as at about 3,056 cm−1, was observed due to process. Mid IR spectral analysis was used to calculate the content of the epoxy groups as a function of crosslinking time and the crosslinking degree of resin. The amount of all the epoxy species was estimated from IR spectra to changes during the crosslinking kinetics of epichlorhydrin.

Modification of graphene with silica nanoparticles for use in hybrid network formation from epoxy, novolac, and epoxidized novolac resins by sol-gel method: Investigation of thermal properties

“…The proposed schematic illustration for the structure of SGNEH composites amine groups of the hardener. In addition, high proportion of silica/siloxane moieties results in lower intensity of methylene and methyl peaks [43]. In Figure 5, surface elemental composition of GO and SFGO was investigated using XPS.…”

Reticulação de plastissóis de PVC utilizando resina epóxi polifuncional: Síntese e caracterização

“…Bandas características do grupo amida, na região de 3280 cm -1 , bem como em 1650 cm -1 , são facilmente identificadas no espectro do amino acelerador [16][17][18][19] . Dois picos bastante intensos, em 2850 cm -1 e 2920 cm -1 , característicos do segmento alifático desta molécula, são também facilmente visualizados.…”

Synthesis of Polyurethane/Silica Modified Epoxy Polymer Based on 1,3-Propanediol for Coating Application

“…The another overlap absorption was showed by the peaks of epoxy group at region 3000 cm -1 assigned to symmetric stretching of C-H of the oxirane ring. The C-O oxirane ring absorption was showed at 915 cm -1 , and according to Nikolic et al [25] and Cholake et al [26] the peaks of epoxy group will decrease during the crosslinking process as shown in the FTIR spectra.…”